<template>
    <view class="uni-cursor-point">
        <view v-if="popMenu && (leftBottom||rightBottom||leftTop||rightTop) && content.length > 0" :class="{
        'uni-fab--leftBottom': leftBottom,
        'uni-fab--rightBottom': rightBottom,
        'uni-fab--leftTop': leftTop,
        'uni-fab--rightTop': rightTop
      }" class="uni-fab">
            <view :class="{
          'uni-fab__content--left': horizontal === 'left',
          'uni-fab__content--right': horizontal === 'right',
          'uni-fab__content--flexDirection': direction === 'vertical',
          'uni-fab__content--flexDirectionStart': flexDirectionStart,
          'uni-fab__content--flexDirectionEnd': flexDirectionEnd,
		  'uni-fab__content--other-platform': !isAndroidNvue
        }" :style="{ width: boxWidth, height: boxHeight, backgroundColor: styles.backgroundColor }"
                  class="uni-fab__content" elevation="5">
                <view v-if="flexDirectionStart || horizontalLeft" class="uni-fab__item uni-fab__item--first"/>
                <view v-for="(item, index) in content" :key="index" :class="{ 'uni-fab__item--active': isShow }"
                      class="uni-fab__item" @click="_onItemClick(index, item)">
                    <image :src="item.active ? item.selectedIconPath : item.iconPath" class="uni-fab__item-image"
                           mode="aspectFit"/>
                    <text class="uni-fab__item-text"
                          :style="{ color: item.active ? styles.selectedColor : styles.color }">{{ item.text }}
                    </text>
                </view>
                <view v-if="flexDirectionEnd || horizontalRight" class="uni-fab__item uni-fab__item--first"/>
            </view>
        </view>
        <view :class="{
		  'uni-fab__circle--leftBottom': leftBottom,
		  'uni-fab__circle--rightBottom': rightBottom,
		  'uni-fab__circle--leftTop': leftTop,
		  'uni-fab__circle--rightTop': rightTop,
		  'uni-fab__content--other-platform': !isAndroidNvue
		}" class="uni-fab__circle uni-fab__plus" :style="{ 'background-color': styles.buttonColor }" @click="_onClick">
            <uni-icons class="fab-circle-icon" type="plusempty" :color="styles.iconColor" size="32"
                       :class="{'uni-fab__plus--active': isShow && content.length > 0}"></uni-icons>
            <!-- <view class="fab-circle-v"  :class="{'uni-fab__plus--active': isShow && content.length > 0}"></view>
            <view class="fab-circle-h" :class="{'uni-fab__plus--active': isShow  && content.length > 0}"></view> -->
        </view>
    </view>
</template>

<script>
    let platform = 'other'
    // #ifdef APP-NVUE
    platform = uni.getSystemInfoSync().platform
    // #endif

    /**
     * Fab 悬浮按钮
     * @description 点击可展开一个图形按钮菜单
     * @tutorial https://ext.dcloud.net.cn/plugin?id=144
     * @property {Object} pattern 可选样式配置项
     * @property {Object} horizontal = [left | right] 水平对齐方式
     *    @value left 左对齐
     *    @value right 右对齐
     * @property {Object} vertical = [bottom | top] 垂直对齐方式
     *    @value bottom 下对齐
     *    @value top 上对齐
     * @property {Object} direction = [horizontal | vertical] 展开菜单显示方式
     *    @value horizontal 水平显示
     *    @value vertical 垂直显示
     * @property {Array} content 展开菜单内容配置项
     * @property {Boolean} popMenu 是否使用弹出菜单
     * @event {Function} trigger 展开菜单点击事件，返回点击信息
     * @event {Function} fabClick 悬浮按钮点击事件
     */
    export default {
        name: 'UniFab',
        emits: ['fabClick', 'trigger'],
        props: {
            pattern: {
                type: Object,
                default() {
                    return {}
                }
            },
            horizontal: {
                type: String,
                default: 'left'
            },
            vertical: {
                type: String,
                default: 'bottom'
            },
            direction: {
                type: String,
                default: 'horizontal'
            },
            content: {
                type: Array,
                default() {
                    return []
                }
            },
            show: {
                type: Boolean,
                default: false
            },
            popMenu: {
                type: Boolean,
                default: true
            }
        },
        data() {
            return {
                fabShow: false,
                isShow: false,
                isAndroidNvue: platform === 'android',
                styles: {
                    color: '#3c3e49',
                    selectedColor: '#007AFF',
                    backgroundColor: '#fff',
                    buttonColor: '#007AFF',
                    iconColor: '#fff'
                }
            }
        },
        computed: {
            contentWidth(e) {
                return (this.content.length + 1) * 55 + 15 + 'px'
            },
            contentWidthMin() {
                return '55px'
            },
            // 动态计算宽度
            boxWidth() {
                return this.getPosition(3, 'horizontal')
            },
            // 动态计算高度
            boxHeight() {
                return this.getPosition(3, 'vertical')
            },
            // 计算左下位置
            leftBottom() {
                return this.getPosition(0, 'left', 'bottom')
            },
            // 计算右下位置
            rightBottom() {
                return this.getPosition(0, 'right', 'bottom')
            },
            // 计算左上位置
            leftTop() {
                return this.getPosition(0, 'left', 'top')
            },
            rightTop() {
                return this.getPosition(0, 'right', 'top')
            },
            flexDirectionStart() {
                return this.getPosition(1, 'vertical', 'top')
            },
            flexDirectionEnd() {
                return this.getPosition(1, 'vertical', 'bottom')
            },
            horizontalLeft() {
                return this.getPosition(2, 'horizontal', 'left')
            },
            horizontalRight() {
                return this.getPosition(2, 'horizontal', 'right')
            }
        },
        watch: {
            pattern: {
                handler(val, oldVal) {
                    this.styles = Object.assign({}, this.styles, val)
                },
                deep: true
            }
        },
        created() {
            this.isShow = this.show
            if (this.top === 0) {
                this.fabShow = true
            }
            // 初始化样式
            this.styles = Object.assign({}, this.styles, this.pattern)
        },
        methods: {
            _onClick() {
                this.$emit('fabClick')
                if (!this.popMenu) {
                    return
                }
                this.isShow = !this.isShow
            },
            open() {
                this.isShow = true
            },
            close() {
                this.isShow = false
            },
            /**
             * 按钮点击事件
             */
            _onItemClick(index, item) {
                this.$emit('trigger', {
                    index,
                    item
                })
            },
            /**
             * 获取 位置信息
             */
            getPosition(types, paramA, paramB) {
                if (types === 0) {
                    return this.horizontal === paramA && this.vertical === paramB
                } else if (types === 1) {
                    return this.direction === paramA && this.vertical === paramB
                } else if (types === 2) {
                    return this.direction === paramA && this.horizontal === paramB
                } else {
                    return this.isShow && this.direction === paramA ? this.contentWidth : this.contentWidthMin
                }
            }
        }
    }
</script>

<style lang="scss">
    $uni-shadow-base: 0 1px 5px 2px rgba($color: #000000, $alpha: 0.3) !default;

    .uni-fab {
        position: fixed;
        /* #ifndef APP-NVUE */
        display: flex;
        /* #endif */
        justify-content: center;
        align-items: center;
        z-index: 10;
        border-radius: 45px;
        box-shadow: $uni-shadow-base;
    }

    .uni-cursor-point {
        /* #ifdef H5 */
        cursor: pointer;
        /* #endif */
    }

    .uni-fab--active {
        opacity: 1;
    }

    .uni-fab--leftBottom {
        left: 15px;
        bottom: 30px;
        /* #ifdef H5 */
        left: calc(15px + var(--window-left));
        bottom: calc(30px + var(--window-bottom));
        /* #endif */
        // padding: 10px;
    }

    .uni-fab--leftTop {
        left: 15px;
        top: 30px;
        /* #ifdef H5 */
        left: calc(15px + var(--window-left));
        top: calc(30px + var(--window-top));
        /* #endif */
        // padding: 10px;
    }

    .uni-fab--rightBottom {
        right: 15px;
        bottom: 30px;
        /* #ifdef H5 */
        right: calc(15px + var(--window-right));
        bottom: calc(30px + var(--window-bottom));
        /* #endif */
        // padding: 10px;
    }

    .uni-fab--rightTop {
        right: 15px;
        top: 30px;
        /* #ifdef H5 */
        right: calc(15px + var(--window-right));
        top: calc(30px + var(--window-top));
        /* #endif */
        // padding: 10px;
    }

    .uni-fab__circle {
        position: fixed;
        /* #ifndef APP-NVUE */
        display: flex;
        /* #endif */
        justify-content: center;
        align-items: center;
        width: 55px;
        height: 55px;
        background-color: #3c3e49;
        border-radius: 45px;
        z-index: 11;
        // box-shadow: $uni-shadow-base;
    }

    .uni-fab__circle--leftBottom {
        left: 15px;
        bottom: 30px;
        /* #ifdef H5 */
        left: calc(15px + var(--window-left));
        bottom: calc(30px + var(--window-bottom));
        /* #endif */
    }

    .uni-fab__circle--leftTop {
        left: 15px;
        top: 30px;
        /* #ifdef H5 */
        left: calc(15px + var(--window-left));
        top: calc(30px + var(--window-top));
        /* #endif */
    }

    .uni-fab__circle--rightBottom {
        right: 15px;
        bottom: 30px;
        /* #ifdef H5 */
        right: calc(15px + var(--window-right));
        bottom: calc(30px + var(--window-bottom));
        /* #endif */
    }

    .uni-fab__circle--rightTop {
        right: 15px;
        top: 30px;
        /* #ifdef H5 */
        right: calc(15px + var(--window-right));
        top: calc(30px + var(--window-top));
        /* #endif */
    }

    .uni-fab__circle--left {
        left: 0;
    }

    .uni-fab__circle--right {
        right: 0;
    }

    .uni-fab__circle--top {
        top: 0;
    }

    .uni-fab__circle--bottom {
        bottom: 0;
    }

    .uni-fab__plus {
        font-weight: bold;
    }

    // .fab-circle-v {
    // 	position: absolute;
    // 	width: 2px;
    // 	height: 24px;
    // 	left: 0;
    // 	top: 0;
    // 	right: 0;
    // 	bottom: 0;
    // 	/* #ifndef APP-NVUE */
    // 	margin: auto;
    // 	/* #endif */
    // 	background-color: white;
    // 	transform: rotate(0deg);
    // 	transition: transform 0.3s;
    // }

    // .fab-circle-h {
    // 	position: absolute;
    // 	width: 24px;
    // 	height: 2px;
    // 	left: 0;
    // 	top: 0;
    // 	right: 0;
    // 	bottom: 0;
    // 	/* #ifndef APP-NVUE */
    // 	margin: auto;
    // 	/* #endif */
    // 	background-color: white;
    // 	transform: rotate(0deg);
    // 	transition: transform 0.3s;
    // }

    .fab-circle-icon {
        transform: rotate(0deg);
        transition: transform 0.3s;
        font-weight: 200;
    }

    .uni-fab__plus--active {
        transform: rotate(135deg);
    }

    .uni-fab__content {
        /* #ifndef APP-NVUE */
        box-sizing: border-box;
        display: flex;
        /* #endif */
        flex-direction: row;
        border-radius: 55px;
        overflow: hidden;
        transition-property: width, height;
        transition-duration: 0.2s;
        width: 55px;
        border-color: #DDDDDD;
        border-width: 1 rpx;
        border-style: solid;
    }

    .uni-fab__content--other-platform {
        border-width: 0px;
        box-shadow: $uni-shadow-base;
    }

    .uni-fab__content--left {
        justify-content: flex-start;
    }

    .uni-fab__content--right {
        justify-content: flex-end;
    }

    .uni-fab__content--flexDirection {
        flex-direction: column;
        justify-content: flex-end;
    }

    .uni-fab__content--flexDirectionStart {
        flex-direction: column;
        justify-content: flex-start;
    }

    .uni-fab__content--flexDirectionEnd {
        flex-direction: column;
        justify-content: flex-end;
    }

    .uni-fab__item {
        /* #ifndef APP-NVUE */
        display: flex;
        /* #endif */
        flex-direction: column;
        justify-content: center;
        align-items: center;
        width: 55px;
        height: 55px;
        opacity: 0;
        transition: opacity 0.2s;
    }

    .uni-fab__item--active {
        opacity: 1;
    }

    .uni-fab__item-image {
        width: 20px;
        height: 20px;
        margin-bottom: 4px;
    }

    .uni-fab__item-text {
        color: #FFFFFF;
        font-size: 12px;
        line-height: 12px;
        margin-top: 2px;
    }

    .uni-fab__item--first {
        width: 55px;
    }
</style>
